Volume ray casting, sometimes called volumetric ray casting, volumetric ray tracing, or volume ray marching, is an image-based volume rendering technique. It computes 2D images from 3D volumetric data sets. Volume ray casting, which processes volume data, must not be mistaken with ray casting, which processes surface data.
Read more about Volume Ray Casting: Classification, Basic Algorithm, Advanced Adaptive Algorithms, Examples of High Quality Volumetric Ray-casting
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